Stone polisher



March 8,1932. C. s, CUSHMAN 1,848,463

STONE POLI SHER Filed Oct. 1'7, 1928 7E-2- fff 2 Sheets-Sheet l Z9 Z7 Z0 Y March`8, 1932. c. s. CUSHMAN STONE POLI SHER 2 sheets-sheet 2 Filed Oct. 1'7, 1929 Patented Mar. 8, 1932 PATENT OFFICE CHARLES S. CUSHMAN, OF BARRE, VERMONT STONE POLISHER Appnation led'oetober 17, 192s.

This invention relates to new and useful improvements in Astone polishing machines, and particularly vto means for supplying the stone and polishing wheel with abrasive ma- Kj teria-1. p

' One object of the present invention is to provide means for receiving the 'abrasive material lthrown by centrifugal force from the stone, and wheel, as the vwheel operates upon the stone. i

v'Another object is to provide means for automatically removing the abrasive material from the receptacles at the sides of the stone, A andfdepositing the same on the stone.

' 15 '.Other' objects and advantages will be apparent vfrom the following description 'when taken in connection with the accompanying drawings.

In the drawings:

Figure 1 is an elevation of the device.

i Figure 2 is a top plan view of the same.

Figure 3 is a vertical sectional detail view on'the line 3 3 of Figure 1.

Figure l: is an elevation of the device when used in connection with a center feed polishing wheel.

Figure 5 is a side view of the same. Referring particularly to the accompanying drawings, 10 represents a stone to be polished, said stone supported over the inner edge portionsV of suitable gutters or troughs 11, arranged at the sides of the stone, for receiving theabraslve material thrown from thestone bythe polishing wheel 12. Dis- '235' posed above'the stone, and supported in any suitable nianner,'are the beams 13, and mounted on4 the sides of said beams are the longitudinally'extending guide rods 14 and 15, the former being disposed adjacent one end ofthebeam, while the latter is disposed adjacenty the other end of the beam. Slidable on the guide rods, respectively, are the tubular members 16 and 1 7, having the integrally formed, vertically, extendingtubular portionsr `18-and 19, respectively.r These rods 14 andl are properly spaced from the beav sothat'said members 16 and 17 may slide f freely thereon.' PivotallyV mounted between the guide vrodsand the beams, as shown at 20' and 21, adjacentthe inner k@has of Said Serial No 313,097.

rods, are the bell crank levers 2O and 21, each having one of its arms provided with a longitudinal slot 22, in the outer or free end thereof. Disposed in the slot, and arranged to be adjusted longitudinally therein, is a member 23, which has an end of a threaded adj usting rod 24 engaged therethrough, and by means of which threaded rod, member 23 may be moved from one end of the slot to the other, to adapt the device for stone beds of different widths. Slidable through the vertical tubular portions 18 and 19, and having their upper ends pivotally connected respectively with the members 23 are the rods 25. The lower ends of the rods 25 are connected 65 with an electro-magnet 26, as clearly shown in the drawings. A similar rod 25 is associated with the bell crank 21, and carries an electro-magnet 26.

Disposed transversely of one end of the beam 13 is a shaft 27, which is driven at its central portion by the motor 28. On each end of the shaft there is mounted a crank 29, such cranks extending radiall from the shaft in a common direction. onnec-ted to one of the cranks 29 is a link 30, which has its other end pivotally connected with the other arm of the bell crank lever 20, while a second link 30, of similar length, is connected with the other crank 29, and with the other arm of the bell crank lever 21.

Disposed in the upward paths of the bell f crank levers 20 and 2l are the switches 31 and 32, each including a pivoted arm 33, ywhichis normally held in circuit closing position by means of the spring 34, such arm being adapted to be moved into circuit opened position by means of a plunger 35 engaged and moved by the bell crank arm, when the latter has reached the limit of its upward pivotal movement. The current for the electro-magnets is obtained from any suitable source, and may be wired thereto, through the switches in any approved and n well known manner. 95

The operation may be described as follows:

A suitable quantity of abrasive material, in theform of steel balls 136, is placed in the troughs or gutters, and on the stone to be polished. The operator then starts the motor nets inthe trough to. attract arquantity of steel balls, and to lift such loadof balls and 28, to cause the shaft 27 to rotate, which operates the links 30 and 30 to rock the bell crank levers 29 so that one of said levers will be swung downwardly, while the other will be swung upwardl .t As' the downwardly swinging lever reaches the lower limit of its movement, the .electromagnet carried by its rod 25 will be disposedin the adjacent trough or gutter, and by reason of the fact that its switch 32 is closed, such magnet willbe energized, and attract theretoaquantity ofthe steel balls. As the shaft 27 continues torotate, the links operate upon the said crank to cause the said crank 29 to be swung upwardl ly, while at the same time the" other 'crank 1sv While the `firstfnarned swung downwardly.

' the other crank v was vin l its. `lowered Y position,

crank had operatedjits switch to cut off the current, v,and thereby de-energize the .magnet 26', with the resultthat such magnet released ritsload of balls andpermitted the same to fall ishing vwheel shaft 45,

ontothestonebeing polished. Thus, asthe Shaft 27 .continues to rotate, the links'V cause the bell cranklevers to be alternately swung downwardly to dispose theirl electro-magdeposit them on :the stone bed. This operation-,continues as long as the motor 2871s-t1n motion,so that the stone, and polishing wheel Yareproperlyand. automatically supplied with dressing' thefface of the abrasive'material for stone. I t i i Referring to Figures `4 and 5, there 1s shown avform of the devicewhen used in connection vwith a center vlfeed polishingwheel. ln' said figures,37 'represents Ythestone to y be polished, while .'38 representsfthe gutters-or troughs which-contain the abrasive material. This material may befsmall'balls offmagnetic metal, yor Vmay be Afilingslof magnetic metal. Abovethe stone arebeams-BQ, similar-tothose of the first form, and carried by'rthesebeams, andy Y depending therefrom, are the 'brackets 40 which support'the funnels' 41,each funnel having a conduit 42 connected with its-lower the stone V37, where it is held in proper position bythe bracket 48 carried by the-sleeve 44, of the polsaid wheel being-indicated bythe numeral 46, and being hollow for the reception of abrasive material delivered .from the ends of the conduits 42; The

electromagnets 47 aremounted and operated Y inthe same manner asv thoseV previouslydescribed, but instead of `deliveringthe abrasive material directly on the face of the stone,

such magnets Vdeposit the material .in the tunnels l41,KA from which such material reaches the stones surfacethrough theconduits and the Y Y center of thepolishing y v l "Theconduits42garepziexible. andfof such wheel.,

f length Vas -to =maintain theirabrasive feeding positions, with respect `tothe stone and ,polishv stone, said e ing wheel, while thel said wheel travels throughout the entire length of the stone;

What is claimed is: 1. An abrasive feeding means for a stone polishing machine including receptacles ad# jacent a stone to be polished for receiving abrasive material thrown from the stone by a'poiishing wheel, an abrasive conveyor extending over the polishingwheelV and stone, electro-magnetic means, and means for operatingthe *,electroeiniagnetic means` whereby to dip the same into the receptacles to attract abrasive material thereto and to dispose the electro-magnetic means in position to discharge such abrasive-material into said conveyor tor be thereby Vconductedto .said stone. 2. An abrasive .feeding'means Vforavstone polishing ,machine including receptacles ad# jacent Y a stone f to be polished .for containing abrasive material and to receive same when thrown from .the stone by aapolishing ele-y ment, electro-magnetic means ,removable finto the receptacles and .out therefrom intoposition over the stone, and means for,energizing said electro-magnetic means whenmoved'f'into the receptacles and I same when moved over the.stone,whereby1to deposit the abrasive materialonthestone;

3. An abrasive feeding means'for astone polisher including.` abrasive containingmeans adjacent a.. stone to bek polished, an .electric circuit including z an electro-magnetic means', means 'for moving the electromagnetic means in and out of the containing means Yand .into and outof position overthel stone, anda cdrcuit controlling means operable to energizethe electro-magneticmeanswhen thellattergenters the receiving meansfto attract abrasivematerial and .operaletto'de-energize :the Aelectrofor v. de-,energiz'ing ,the

magnetic means when the lattenis in Vposition Q5 over the stone whereby to deposit the mates rial on the stone.

4. l,An abrasive Afeedingmeans fora 'stone polishing machineincluding receptacles ad]- acent a stone to be .polishedcontaining magnetic' .brasive ymaterial -vthrown Afrom fthe stone, and lelectro-magneticfmeans, .movable between the receptacles and stone'for rautbl matically lifting the 'abrasive' .material Vfrom thereceptac'les and depositingtheirsame on the lectro-.magneticitmeans @including a supportaboveV the stone and-receptacles, rockable elements on'. the support', means slidable on ,thetsuppoit between said ,rece tacles andsaid stone, lelectro-magnetic inganeansA reciprocable Avertically through said slidable meansfand jmeans for ,rocking the rockable-elements.V 'Y

erincluding receptacles adj aeent the stone to be :poli-shed 'containing vinagnetic abrasive-material', ,electro-magnetic'vmeansffor klintermittently removin ,portions ofathe ,magnetic material from Atie receptaclesaid means inv, An abrasi-fe .t feeding i the y center-feed polishing wheel of astone polishcluding a vertical rod having an electro-magnet thereon, means for receiving such material from the electro-magnetic means and depositing the same centrally within the center of said polishing wheel, and means for opl erating said material removing means including a bell crank pivotally supported above the polishing Wheel, a transversely slidable member, a vertical tubular member rockably supported on said slidable member, said vertical rod slidable in said tubular member, an end of said rod beingv pvotally connected with an end of one arm of said bell crank lever, and means for rocking said bell crank.

In testimony whereof, I affix my signature.

CHARLES S. CUSHMAN. 

